<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>p2_元素消失方式</title>
    <style>
        div{
            width: 200px;
            height: 200px;
            border: 5px solid #000;
        }
        .d1{
            background-color: #f00;
        }
        .d1:hover{
            transform: scale(0);
        }
        .d2{
            background-color: #0f0;
        }
        .d2:hover{
            display: none;
        }
        .d3{
            background-color: #00f;
        }
        .d3:hover{
            background-color: rgba(255,255,255,0);
        }
    </style>
</head>
<body>
<div class="d1"></div>
<div class="d2"></div>
<div class="d3"></div>
</body>
</html>